Shimano xt brake lever leaking Then loosen the bleed nipple by 1/8 of a turn to open it. Hi guys. I wiped it off a few times but it keeps coming back Jan 9, 2023 · I've honestly never had a leak anywhere on various sets of Shimano brakes over the years, from entry level to the SLX 4 pots I've got now. No issues. Jan 28, 2013 · Seem to have a leak on my rear brake lever ('new' XT). Learn more I was recently installing a some Shimano hydraulic brake lines on a bike which uses GRX levers when I noticed brake oil leaking out of a port on the side of the lever. The nut is tight but that means nothing if cross threaded or Dec 20, 2021 · I assume you've checked the banjo/hose connection, etc for leaks to be sure fluid isn't leaking from somewhere else. In fact my M7000 levers are five years old and still good. Edit: and utterly shit how Shimano doesn't condone selling small parts to make repairs easier. and the brake works but with a lot of travel. Apr 20, 2021 · Join the discussion on Pinkbike forum about Shimano Saint M820 brake lever issues and solutions, and explore other biking topics. After watching mutitudinous videos. The occasional wandering bite point on successive pulls, the rather fragile lever blades - especially on XT brakes - and one last one that is more of a silent killer: the expansion bladder. Also do not use it if the aluminum surface becomes visible. But if was damaged, you can still find replacement for diaphragm: According to Shima Because each bicycle may handle slightly differently depending on the model, be sure to learn the proper braking technique (including brake lever pressure and bicycle control characteristics) and operation of your bicycle. Replacing the entire lever is the guaranteed safe solution, but I cannot afford to do so and I'm unsure about availability as well. XT BR-M8120 XT M785 brake reservoir leak when bleeding and possible piston seal leak? Help appreciated. The front one seems like it lost the fluid somehow, the lever goes all the way to handlebar and I see fluid on the back of the lever (the bike was driven 2 days to my house on a vertical hitch rack). May 9, 2022 · My son's right lever is leaking oil from behind the lever arm. However, today all from a sudden, my front rotor started to make a lot of noise and almost without brake power. Improper use of your bicycle's brake system may result in a loss of control or a fall, which could lead to severe injury. Shimano brakes loosing all pressure (not a bleed issue) in All Mountain, Enduro & Cross-Country When installing a Shimano deore xt br-m8120 brake and connecting the oil-filled cable to the lever assembly, I think I didn’t push the cable all the way flush into the lever when tightening the nut. I've never had this problem with shimano brakes except when a caliper leaked. But I've checked for that 3 times now. Brakes are xt 785 lever/xt 8000 caliper with shimano xt View and Download Shimano Deore XT technical service instruction online. It holds pressure when being more aggressive on the brakes, but light modulation doesn't work very well. Dec 26, 2011 · I'm running 2012 Shimano XT brakes and last night I noticed a lack of feel in my front lever. Is this serviceable and if yes, I assume service kits are available? Do not use the disc brake rotor if its thickness is 1. I replaced the whole brake lever left side. Apr 28, 2017 · I use xt calipers with my shimano hydraulic levers. My guess would be on the olive/barb connection where the hose meets the lever. That is just the reach adjustment mechanism for the lever blade. Looks like worn lever bushings led to a worn piston rod seal and now it leaks from there. Same solution, just sand the piston diameter down. The diaphragm from the second photo looks OK and I have hard time imaging how extra pressure would damage it. T Mar 28, 2024 · Shimano brakes suffer from a couple of design flaws that some people can't get over. Jun 23, 2015 · So, mighty fount of knowledge, are the piston seals on a ~2010 Shimano Deore XT brake calliper replaceable, by a mortal or by a LBS? Cheers Ross Looks like I've got a leaking piston, any way to rebuild this or do I need a new caliper. I've noticed that the bleed nipple was not "dry" and probably lost some oil Feb 8, 2025 · My XTR 9000 brake calipers were leaking (more than the Shimano usual) so I bought some new seals to see if that fixed the issue. Rebuilt it with new pistons and seals and re-assembled. The piston is all The SHIMANO DEORE XT M8100 caliper features lightweight braking performance and reliable stopping power in all conditions A couple of weeks later I noticed that the rear lever was oily on the lower side. The brakes still feel good tho, it doesn't feel like there is air in them. I put it back in and bled them but now it leaks. But as someone else said, if there IS a problem, a new lever is the solution, Shimano doesn't offer rebuild kits or anything like that. Any ideas what to try? Apr 22, 2025 · I am wondering if anyone has successfully obtained a warranty replacement for weepy Shimano brake calipers. Only 1-2 times per year do I need to do a quick lever bleed with the cup, burp a couple bubbles out of there and it's good to go again. Are there any seals I can replace in that area of the lever body? Jan 27, 2024 · This video shows how to fix leaking problem on a M9000 brake lever, the problem is the piston inside, I am pretty sure most if not all shimano brake levers u I used the hose and barb from the shimano mt420 caliper, and i couldnt find any instalation video on this XTR lever, but i found one from the gmbn ytb chanel where they were shortening the hoses on a shimano XT. Nov 3, 2022 · I can tell you if it's leaking it's not from the part you circled. Faultless so far (touch wood) Dec 2, 2015 · Are there any of the hub brake guru,s that can help with a XTR lever that is leaking brake fluid around the rubber internal seal and losing pressure as you pull it? . You can take the cover and membrane completely off and the brakes will still function. The oil will start coming out Jul 26, 2021 · Some time ago I noticed my XTR BL-M9100 master cylinder was leaking from under the black plastic end cap. I'd recomend wrapping a paper towel around the bleed block and keep your brake lever pulled with an elastic band trick for a few hours which should let you know which piston the leak could be coming from. Is fluid leaking at the lever a common failure point for Shimano brakes? I've had 3 different pair (mt520, XT, and now Zee) all start leaking fluid which makes its way down the lever and also kinda pools up where I've circled in the second picture. Dec 30, 2022 · Hello everyone! In this video we will look at a common problem associated withhydraulic brake on the bike when the brake lever gets covered with oil andflowi Dec 16, 2023 · - fix for leaking ST-R8070/ST-R9170, you may not need to replace diaphragm. Is there a typical place where these leak? Mar 9, 2024 · As much as I love a shortcut during repetitive tasks, there is one massive mistake you can make while trying to swap out worn Shimano brake pads; not cracking open the bleed port on the lever while pushing the pistons back into their seats. Naturally the lever now goes almost all the way to the bar now. Replacement lever, fix or bin? Bike Forum Last Post by cp 2 years ago 1 Posts Jul 19, 2014 · The reservoir seal wouldn't cause a loss of braking pressure. in Mechanics' Lounge Mar 14, 2022 · my shimano 105 rear brake seems to be leaking fluid. I can't see the source of the leak but I have slightly squishy lever feel and after Jun 2, 2025 · The perfect brake bleed, according to Shimano Keep your Shimano hydraulic brakes performing at their best, plus expert tips to get a flawless lever feel every time So here is what happened: likely at some point your brake lever was topped off with fluid, probably to get rid of the semi squishy shimano feeling that comes from lack of fluid in master cylinder/bubble getting into brake hose fast forward to your trip to the shop: someone probably tried to reset the caliper pistons without opening the bleed port on the lever. There is mineral oil coating all the moving parts behind the lever and it has slowly lost all braking power. There are aftermarket lever pistons for sale on Amazon, ebay, etc. Backstory: Brand new Merida Crossway with basic Shimano hydraulic calipers. Leaking oil from the hose fitting at the threads. It got worse and worse, so i stopped riding and had a look. The reason I am asking is because when I pushed back my caliper pistons to install new brake pads today, a lot of oil suddenly squirted from this part of the lever. I haven't bled it in a while, but it feels firm once it's pumped up This lever originally had the same issues that you see on the SRAM Guide levers where the piston expanded and seized. I checked the piston for damage, I made sure the seal was clean and well lubed with mineral oil and I pushed the Aug 2, 2014 · Hi guys I'm having a serious problem with my xt rear brake lever it's leaking oil out of it, this can be seen on the reach adjust screw also while bl View and Download Shimano BL-M785 manual online. I got the rears swapped no problem. Soaked in alcohol. Nov 15, 2024 · Discover how to fix common Shimano brake problems like squealing, soft levers, and poor stopping power. After two years the fluid is already really dirty and that is exactly why, explained is the video. Is this just bad luck or what? Jul 2, 2021 · Did you try to re-assemble and re-bleed the brakes? Master cylinder should not leak when pistons are fully retracted. System gets over pressurized Dec 17, 2013 · My friend is having a problem with her XT m785 brakes. The good news is that a lever that new may be covered under warranty so chat with the shop you got the levers from. Ernst Wildi. I have had it with bike shops for now, so am going to do my first brake bleed and try to firm these up. I have a Shimano XT brakes for 1 year now. Do not continuously apply the brakes. Apr 15, 2016 · Hi, I need help with my Deore XT M8000 Brake Lever. Other Shimano brake levers ( SLX, XT, XTR, ZEE, SAINT) eomploy a Dec 26, 2017 · i recently took my bike to the LBS for brake service. It appears that the brake fluid is leaking from the point where the hose joins the lever reservoir. Now it is leaking. and it's still leaking. Stop asking how much it weighs and just go ride it. Could be a leak from the master cylinder/brake lever piston seals and oil is running down to that particular point. Parts for levers, there might be some compatibility issues between higher and lower groups. Shimano brake bladder, or diaphragm. To my thinking this indicates the olive or insert (been reading si. because of leaking on the diaphragm the oil might drop in the rotor and will cause a contamination it will affect the braking system. Yeah it's annoying Shimano don't do Mar 27, 2003 · Is there a kit available and instructions? 2006 Shimano XT, seems to be leaking internally. I've heard Shimano don't sell parts/seals etc. Was losing pressure on the brake and after a couple of fruitless bleeds noticed there was fluid around where the hose/olive join the lever Jul 13, 2022 · He has XT brakes with M8000 levers. but no Shimano replacement parts are available to buy. I've had an unexplainable internally chipped ceramic piston, a slight wandering rear bite point and the usual sticky/lazy piston but never actual leaks. I thought a fresh bleed might fix but no luck. I've seen mentioned around a lot that Shimano levers can leak from the upper cylinder (the one that looks like a cannon) but this is not the case. I have personally warrantied some older levers that developed a leaky master cylinder. Doing so may cause a sudden increase in the brake lever stroke, preventing the brakes from Sep 26, 2023 · Has anyone ever seen an XTR caliper that won't stop leaking? I completely disassembled. I'm completely stumped and pissed at my rear brake squeal. I had major problems with brake contamination on my new XT brakes last year when I started back up in the spring after being off the bike for a while due to injury. Everything went normal in the process and I've ride the bike several times since then. I suspect the master piston seals are starting to leak. I was quite careful when I put it back in. Jul 22, 2010 · I made the mistake of popping one of the pistons out while bleeding my m775 brakes. She noticed the rear one felt a bit spongy and would sometimes need to be "pumped up" to work. Best brakes I've ever had. Braking power is fine, so I'm sure its not a leak. Jul 4, 2019 · I have 2 Shimano levers that weep a little over time (out the side of the lever body). If it dies I'll just replace it. Sep 27, 2021 · Now comes to the issue: I noticed my rear brake was rubbing, my pistons were slightly distended so I grab a pad spreader, push the brake pads apart, only for the valve's seal (as pictured) on my rear brake lever to give way and shoot fluid on my shoulder. . I've made the first bleed for both front and rear brakes. Some fluid ended up leaking out from the plug piece on the outboard end of the master cylinder. Replace the disc brake rotor with a new one. DEORE XT Brake Lever For Disc Brake. any idea: what's causing it how to fix it I've checked for loose nuts etc. However, if a plunger seal blew out, that would probably cause fluid to shove backward into the reservoir and out the membrane seal. Bike shop that May 11, 2025 · I've just had my Shimano XT brake calipers replaced under warranty (due to leaks) by a local shop and they came back to me with too much play in the levers. Is there any way to salvage this or is the whole lever assembly toast? Dec 5, 2021 · 12 My right brake lever (Shimano BL-M9020 to be specific) has attracted some dirt around the blade pivot area, and some parts look shiny. Push the plunger of the syringe to add oil. It's pretty slow. The leak happened in one short squirt of fluid, with no ongoing leakage. Learn tips and upgrade options for better braking. The little brass fitting inside the lever is deformed and it is now leaking oil. Aug 5, 2023 · It really is surprising how much grit accumulates behind the lever blade. Time for a ne Dec 18, 2023 · My front brakes are leaking fluid. ) Once air stops coming out, temporarily close the bleed nipple. I kindly (If using the Shimano bleeding tool, be sure to read the service instructions for the Shimano bleeding tool. The disc brake rotor may break, and result in serious injury due to a fall or collision. thanks in advance Set the brake lever so that it is parallel to the ground, and Bleed screw then remove the upper bleed screw and insert the oil funnel and the oil stopper. deore XT bicycle accessories pdf manual download. Blew it clean. thank you for Jun 3, 2019 · I reset the pistons in my XT M8000s to put in some new pads, and the brakes must have been overfilled with fluid. 00:00 Disassembly 04:10 Shimano brake lever leaking. Everything was fine until i noticed that the right lever (back brake) was leaking. Brake wouldn't stay air free through repeated bleeds. Rebuild or replace? When applying light pressure on the brakes with the wheel rolling, my Shimano Deore lever slowly compress until it touches the grip. On the front, when I pushed the piston in, I think it folded over the seal and pulled it down into the cavity. I added mineral oil on it using a syringe , i think i i accidentally put a small hole on my brakes. I checked the manuals on the shimano website and i can't seem to find any information how to fix my problem. You can buy individual If you ever overfill shimano brakes and accidentally over-pressurise them, you can have leakage from the end cap - this is oil escaping from the diaphragm. This is not something I personally experienced, but maybe the system simply had too much brake fluid in it. At first I thought it was the olive, but it seems like it's coming from the piston area, dripping down to the underside of the lever. Hit up my LBS and I got a replacement master cylinder / lever as some r*tard at Shimano deemed it best not to sell repair kits or spares for these brakes! I install and bleed the new master My lever nearly touches the handle bar on my hydraulic shimano xt disc brakes. ) Jun 20, 2022 · I think my right M6100 is leaking. BL-M785 bicycle accessories pdf manual download. Did I blow a Following a stuck piston inside a Shimano BL M615 Deore hydraulic brake lever I fully strip down the lever and repair the piston. Works ok if I pump the lever, but then bleeds off pressure. Since then, I've cleaned it several times with alcohol, but it has developed a case of small but continuous leaking. 5 mm or less. Every time i press the lever, it sort of "burps" a bit of o Mar 12, 2019 · I'm not sure of the exact conditions that trigger the leaking, for example is it peak pressure, or rapid cycling on/off of braking force, but you could try zip tying the brake into the on position and leaving it overnight to see if you can confirm where the leak is. (If the Shimano bleeding tool has been installed to the brake lever at this time, remove the Shimano bleeding tool. Oil funnel Attach a 7 mm socket wrench, and fill the syringe with oil and connect a hose to the bleed nipple. Oct 23, 2021 · Need ideas. Jul 14, 2023 · Shimano M785 XT brake lever leak. shimano tech docs) isn’t seated well. I suspect it is the conspicuous, but rarely mentioned, cannon-resembling big round ending on top of many Shimano brake lever models, which I highlight in the picture below. edqvoe qcx klynfj rahfvz sdypwry jlntkf